[Task]: Allow URLs in developer replies to add-on ratings

[abyrne-moz]

Description

As a Developer, replying to an add-on rating, I want to be able to post a URL in reply to a rating to provide further context and links to bugs and support.

This is a followup to https://github.com/mozilla/addons/issues/14973

Acceptance Criteria

  ### Milestones/checkpoints
  - [ ] A developer replying to an add-on rating is able to post a URL without it being blocked

Checks

• [X] If I have identified that the work is specific to a repository, I have removed "repository:addons-server" or "repository:addons-frontend"

┆Issue is synchronized with this Jira Task